26 · Fe

Iron

Known and worked since antiquity, with no discovery year.

Identity

Atomic number: 26
Symbol: Fe
Canonical name: Iron
Category: transition metal
Group: 8
Period: 4
Block: d
Other names: ferrum

Properties

These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.

Atomic mass: 55.8452 u
Electron configuration: [Ar] 3d6 4s2
Electrons per shell: 2, 8, 14, 2
Standard state: solid
Density: 7.874 g/cm³
Melting point: 1,811 K
Boiling point: 3,134 K
Electronegativity: 1.83 Pauling
First ionization energy: 762.5 kJ/mol
Electron affinity: 14.785 kJ/mol

History

Antiquity

Iron was worked long before modern chemistry. No discovery year can be assigned.

See the element timeline

Etymology

Theme: other
Language: latin
Root: ferrum
Meaning: iron

Sources

IUPAC, Periodic Table of the Elements
Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.